kernel/Documentation/devicetree/bindings/usb/snps,dwc3.yaml

# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/usb/snps,dwc3.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Synopsys DesignWare USB3 Controller

maintainers:
  - Felipe Balbi <balbi@kernel.org>

description:
  This is usually a subnode to DWC3 glue to which it is connected, but can also
  be presented as a standalone DT node with an optional vendor-specific
  compatible string.

allOf:
  - $ref: usb-drd.yaml#
  - if:
      properties:
        dr_mode:
          const: peripheral

      required:
        - dr_mode
    then:
      $ref: usb.yaml#
    else:
      $ref: usb-xhci.yaml#

properties:
  compatible:
    contains:
      oneOf:
        - const: snps,dwc3
        - const: synopsys,dwc3
          deprecated: true

  interrupts:
    description:
      It's either a single common DWC3 interrupt (dwc_usb3) or individual
      interrupts for the host, gadget and DRD modes.
    minItems: 1
    maxItems: 3

  interrupt-names:
    minItems: 1
    maxItems: 3
    oneOf:
      - const: dwc_usb3
      - items:
          enum: [host, peripheral, otg]

  clocks:
    description:
      In general the core supports three types of clocks. bus_early is a
      SoC Bus Clock (AHB/AXI/Native). ref generates ITP when the UTMI/ULPI
      PHY is suspended. suspend clocks a small part of the USB3 core when
      SS PHY in P3. But particular cases may differ from that having less
      or more clock sources with another names.

  clock-names:
    contains:
      anyOf:
        - enum: [bus_early, ref, suspend]
        - true

  usb-phy:
    minItems: 1
    items:
      - description: USB2/HS PHY
      - description: USB3/SS PHY

  phys:
    minItems: 1
    items:
      - description: USB2/HS PHY
      - description: USB3/SS PHY

  phy-names:
    minItems: 1
    items:
      - const: usb2-phy
      - const: usb3-phy

  resets:
    minItems: 1

  snps,usb2-lpm-disable:
    description: Indicate if we don't want to enable USB2 HW LPM for host
      mode.
    type: boolean

  snps,usb3_lpm_capable:
    description: Determines if platform is USB3 LPM capable
    type: boolean

  snps,usb2-gadget-lpm-disable:
    description: Indicate if we don't want to enable USB2 HW LPM for gadget
      mode.
    type: boolean

  snps,dis-start-transfer-quirk:
    description:
      When set, disable isoc START TRANSFER command failure SW work-around
      for DWC_usb31 version 1.70a-ea06 and prior.
    type: boolean

  snps,disable_scramble_quirk:
    description:
      True when SW should disable data scrambling. Only really useful for FPGA
      builds.
    type: boolean

  snps,has-lpm-erratum:
    description: True when DWC3 was configured with LPM Erratum enabled
    type: boolean

  snps,lpm-nyet-threshold:
    description: LPM NYET threshold
    $ref: /schemas/types.yaml#/definitions/uint8

  snps,u2exit_lfps_quirk:
    description: Set if we want to enable u2exit lfps quirk
    type: boolean

  snps,u2ss_inp3_quirk:
    description: Set if we enable P3 OK for U2/SS Inactive quirk
    type: boolean

  snps,req_p1p2p3_quirk:
    description:
      When set, the core will always request for P1/P2/P3 transition sequence.
    type: boolean

  snps,del_p1p2p3_quirk:
    description:
      When set core will delay P1/P2/P3 until a certain amount of 8B10B errors
      occur.
    type: boolean

  snps,del_phy_power_chg_quirk:
    description: When set core will delay PHY power change from P0 to P1/P2/P3.
    type: boolean

  snps,lfps_filter_quirk:
    description: When set core will filter LFPS reception.
    type: boolean

  snps,rx_detect_poll_quirk:
    description:
      when set core will disable a 400us delay to start Polling LFPS after
      RX.Detect.
    type: boolean

  snps,tx_de_emphasis_quirk:
    description: When set core will set Tx de-emphasis value
    type: boolean

  snps,tx_de_emphasis:
    description:
      The value driven to the PHY is controlled by the LTSSM during USB3
      Compliance mode.
    $ref: /schemas/types.yaml#/definitions/uint8
    enum:
      - 0 # -6dB de-emphasis
      - 1 # -3.5dB de-emphasis
      - 2 # No de-emphasis

  snps,dis_u3_susphy_quirk:
    description: When set core will disable USB3 suspend phy
    type: boolean

  snps,dis_u2_susphy_quirk:
    description: When set core will disable USB2 suspend phy
    type: boolean

  snps,dis_enblslpm_quirk:
    description:
      When set clears the enblslpm in GUSB2PHYCFG, disabling the suspend signal
      to the PHY.
    type: boolean

  snps,dis-u1-entry-quirk:
    description: Set if link entering into U1 needs to be disabled
    type: boolean

  snps,dis-u2-entry-quirk:
    description: Set if link entering into U2 needs to be disabled
    type: boolean

  snps,dis_rxdet_inp3_quirk:
    description:
      When set core will disable receiver detection in PHY P3 power state.
    type: boolean

  snps,dis-u2-freeclk-exists-quirk:
    description:
      When set, clear the u2_freeclk_exists in GUSB2PHYCFG, specify that USB2
      PHY doesn't provide a free-running PHY clock.
    type: boolean

  snps,dis-del-phy-power-chg-quirk:
    description:
      When set core will change PHY power from P0 to P1/P2/P3 without delay.
    type: boolean

  snps,dis-tx-ipgap-linecheck-quirk:
    description: When set, disable u2mac linestate check during HS transmit
    type: boolean

  snps,parkmode-disable-ss-quirk:
    description:
      When set, all SuperSpeed bus instances in park mode are disabled.
    type: boolean

  snps,dis_metastability_quirk:
    description:
      When set, disable metastability workaround. CAUTION! Use only if you are
      absolutely sure of it.
    type: boolean

  snps,dis-split-quirk:
    description:
      When set, change the way URBs are handled by the driver. Needed to
      avoid -EPROTO errors with usbhid on some devices (Hikey 970).
    type: boolean

  snps,is-utmi-l1-suspend:
    description:
      True when DWC3 asserts output signal utmi_l1_suspend_n, false when
      asserts utmi_sleep_n.
    type: boolean

  snps,hird-threshold:
    description: HIRD threshold
    $ref: /schemas/types.yaml#/definitions/uint8

  snps,hsphy_interface:
    description:
      High-Speed PHY interface selection between UTMI+ and ULPI when the
      DWC_USB3_HSPHY_INTERFACE has value 3.
    $ref: /schemas/types.yaml#/definitions/string
    enum: [utmi, ulpi]

  snps,quirk-frame-length-adjustment:
    description:
      Value for GFLADJ_30MHZ field of GFLADJ register for post-silicon frame
      length adjustment when the fladj_30mhz_sdbnd signal is invalid or
      incorrect.
    $ref: /schemas/types.yaml#/definitions/uint32
    minimum: 0
    maximum: 0x3f

  snps,rx-thr-num-pkt-prd:
    description:
      Periodic ESS RX packet threshold count (host mode only). Set this and
      snps,rx-max-burst-prd to a valid, non-zero value 1-16 (DWC_usb31
      programming guide section 1.2.4) to enable periodic ESS RX threshold.
    $ref: /schemas/types.yaml#/definitions/uint8
    minimum: 1
    maximum: 16

  snps,rx-max-burst-prd:
    description:
      Max periodic ESS RX burst size (host mode only). Set this and
      snps,rx-thr-num-pkt-prd to a valid, non-zero value 1-16 (DWC_usb31
      programming guide section 1.2.4) to enable periodic ESS RX threshold.
    $ref: /schemas/types.yaml#/definitions/uint8
    minimum: 1
    maximum: 16

  snps,tx-thr-num-pkt-prd:
    description:
      Periodic ESS TX packet threshold count (host mode only). Set this and
      snps,tx-max-burst-prd to a valid, non-zero value 1-16 (DWC_usb31
      programming guide section 1.2.3) to enable periodic ESS TX threshold.
    $ref: /schemas/types.yaml#/definitions/uint8
    minimum: 1
    maximum: 16

  snps,tx-max-burst-prd:
    description:
      Max periodic ESS TX burst size (host mode only). Set this and
      snps,tx-thr-num-pkt-prd to a valid, non-zero value 1-16 (DWC_usb31
      programming guide section 1.2.3) to enable periodic ESS TX threshold.
    $ref: /schemas/types.yaml#/definitions/uint8
    minimum: 1
    maximum: 16

  tx-fifo-resize:
    description: Determines if the TX fifos can be dynamically resized depending
      on the number of IN endpoints used and if bursting is supported.  This
      may help improve bandwidth on platforms with higher system latencies, as
      increased fifo space allows for the controller to prefetch data into its
      internal memory.
    type: boolean

  tx-fifo-max-num:
    description: Specifies the max number of packets the txfifo resizing logic
      can account for when higher endpoint bursting is used. (bMaxBurst > 6) The
      higher the number, the more fifo space the txfifo resizing logic will
      allocate for that endpoint.
    $ref: /schemas/types.yaml#/definitions/uint8
    minimum: 3

  snps,incr-burst-type-adjustment:
    description:
      Value for INCR burst type of GSBUSCFG0 register, undefined length INCR
      burst type enable and INCRx type. A single value means INCRX burst mode
      enabled. If more than one value specified, undefined length INCR burst
      type will be enabled with burst lengths utilized up to the maximum
      of the values passed in this property.
    $ref: /schemas/types.yaml#/definitions/uint32-array
    minItems: 1
    maxItems: 8
    uniqueItems: true
    items:
      enum: [1, 4, 8, 16, 32, 64, 128, 256]

unevaluatedProperties: false

required:
  - compatible
  - reg
  - interrupts

examples:
  - |
    usb@4a030000 {
      compatible = "snps,dwc3";
      reg = <0x4a030000 0xcfff>;
      interrupts = <0 92 4>;
      usb-phy = <&usb2_phy>, <&usb3_phy>;
      snps,incr-burst-type-adjustment = <1>, <4>, <8>, <16>;
    };
  - |
    usb@4a000000 {
      compatible = "snps,dwc3";
      reg = <0x4a000000 0xcfff>;
      interrupts = <0 92 4>;
      clocks = <&clk 1>, <&clk 2>, <&clk 3>;
      clock-names = "bus_early", "ref", "suspend";
      phys = <&usb2_phy>, <&usb3_phy>;
      phy-names = "usb2-phy", "usb3-phy";
      snps,dis_u2_susphy_quirk;
      snps,dis_enblslpm_quirk;
    };
...